Oxygen absorption resin composition

Abstract

An oxygen absorption resin composition is provided that comprises a thermoplastic resin (A) having carbon-carbon double bonds substantially in its main chain and a transition metal salt (B). If necessary, the composition further comprises a gas barrier resin (C), a compatibilizer (D) and the like. The composition has excellent oxygen absorption properties, and when the composition is employed, generation of odorous substances derived from the decomposition of resins as a result of oxygen absorption can be suppressed.

1. An oxygen absorption resin composition comprising:
 a thermoplastic resin (A) having carbon-carbon double bonds substantially in its main chain, wherein the thermoplastic resin (A) is represented by a formula (III): 
 
       
         
           
           
               
               
           
         
         wherein R 7  and R 8  are each independently a hydrogen atom, an alkyl group that may be substituted, an aryl group that may be substituted, an alkylaryl group that may be substituted, —COOR 9 , —OCOR 10 , a cyano group or a halogen atom, and R 9  and R 10  are each independently a hydrogen atom, or an alkyl group having 1 to 10 carbon atoms; 
         a transition metal salt (B), and 
         a gas barrier resin (C), 
         wherein the thermoplastic resin (A) satisfies the following inequality (1):
   100× b /( a+b )≦ X   (1) 
 
         wherein a (mol/g) is an amount of carbon-carbon double bonds in its main chain, b (mol/g) is an amount of carbon-carbon double bonds in its side chain, and X is 10, 
         wherein the oxygen absorption amount of the thermoplastic resin (A) is at least 1.6 moles per 1 mol of carbon·carbon double bonds of the thermoplastic resin (A), and 
         wherein the gas barrier resin (C) is a polyvinyl alcohol resin having an oxygen transmission rate of 20 ml·20 μm(m 2 ·day·atm) or less in 65% RH at 20° C. 
       
     
     
       2. The oxygen absorption resin composition of  claim 1 , wherein the thermoplastic resin (A) satisfies the following inequality (1):
   100× b /( a+b )≦ X   (1) 
 wherein a (mol/g) is an amount of the carbon-carbon double bonds in its main chain, and b (mol/g) is an amount of the carbon-carbon double bonds in its side chain, and X is 7. 
 
     
     
       3. The oxygen absorption resin composition of  claim 1 , wherein the thermoplastic resin (A) is polyoctenylene. 
     
     
       4. The oxygen absorption resin composition of  claim 1 , wherein the transition metal salt (B) is at least one metal salt selected from the group consisting of an iron salt, a nickel salt, a copper salt, a manganese salt and a cobalt salt. 
     
     
       5. The oxygen absorption resin composition of  claim 1 , wherein the oxygen absorption rate is at least 0.01 ml/(g·day). 
     
     
       6. The oxygen absorption resin composition of  claim 1 , wherein the gas barrier resin (C) is an ethylene-vinyl alcohol copolymer having an ethylene content of 5 to 60 mol % and a saponification degree of 90% or more. 
     
     
       7. The oxygen absorption resin composition of  claim 1 , wherein the gas barrier resin (C) is contained in an amount of 70 to 99 wt % and the thermoplastic resin (A) is contained in an amount of 30 to 1 wt %, when the total weight of the thermoplastic resin (A) and the gas barrier resin (C) is determined to be 100 wt %. 
     
     
       8. The oxygen absorption resin composition of  claim 1 , further comprising a compatibilizer (D). 
     
     
       9. The oxygen absorption resin composition of  claim 8 , wherein the gas barrier resin (C) is contained in an amount of 70 to 98.9 wt %, the thermoplastic resin (A) is contained in an amount of 29.9 to 1 wt %, and the compatibilizer (D) is contained in an amount of 29 to 0.1 wt %, when the total weight of the thermoplastic resin (A), the gas barrier resin (C) and the compatibilizer (D) is determined to be 100 wt %. 
     
     
       10. The oxygen absorption resin composition of  claim 1 , wherein particles of the thermoplastic resin (A) are dispersed in a matrix of the gas barrier resin (C). 
     
     
       11. A molded product comprising the oxygen absorption resin composition of  claim 1 . 
     
     
       12. A multilayered structure comprising a layer made of the oxygen absorption resin composition of  claim 1 . 
     
     
       13. A multilayered container comprising a layer made of the oxygen absorption resin composition of  claim 1 . 
     
     
       14. A multilayered container made of a multilayered film having a total layer thickness of 300 μm or less, wherein the multilayered film comprises a layer made of the oxygen absorption resin composition of  claim 1 . 
     
     
       15. A multilayered container comprising a layer made of the oxygen absorption resin composition of  claim 1  and a thermoplastic polyester layer. 
     
     
       16. A cap having a cap body that is provided with a gasket made of the oxygen absorption resin composition of  claim 1 .